Characteristics of filled polyolefins obtained by catalytic polymerization on solid surfaces
Polimery 1994, No 10, 620
Filled plastics are usually obtained by physical blending of polymer, molten or not, with a filler. In the presented process, filled polyolefins have been prepared by polymerizing a monomer directly on the filler surface onto which a polymerization catalyst had been previously anchored. In this way, filler grains covered with a layer of polymer are procured. Filler contents in the polymer blends can be easily controlled. E.g., the contents of above 95% by weight are feasible by changing the polymerization conditions as well as the type and concentration of the catalyst-filler. Thus, it is possible to prepare a large selection of materials with requested, specific and distinct properties. The main advantage of this technology is the possibility of preparing composites with a homogeneous distribution of the filler particles in polymer matrix, even in the case of highly filled materials containing above 90% by weight of filler — this can not be secured by physical blending of components. Moreover, this is the only practical way to formulate such materials. In the paper there are characterized polyethylene-based (mainly on the basis of UHMWPE) and polypropylene-based composites with various fillers, such as Al(OH)3, kaolin, aluminium powder or graphite.
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